Some people complained about light pollution, while others said it was pretty.

Copperstate Farms has 40 acres of greenhouses -- about the size of 30 football fields -- that use a combination of red and blue lights at night to help its plants grow, according to a company spokeswoman.

The lights look purple from a distance, but it's normally nothing like this.

Water droplets in the low-lying fog reflected the light, which made it spread across the sky.

The farm has 70 strains of cannabis in production and another 40 in development and has been growing crops since 2017.